diff --git a/dist/morphlex.js b/dist/morphlex.js
index 92c70bf..2caa85b 100644
--- a/dist/morphlex.js
+++ b/dist/morphlex.js
@@ -114,9 +114,6 @@ function isEqualNode(node, ref) {
 	const referenceNode = ref;
 	return node.isEqualNode(referenceNode);
 }
-// We cannot use `instanceof` when nodes might be from different documents,
-// so we use type guards instead. This keeps TypeScript happy, while doing
-// the necessary checks at runtime.
 function isText(node) {
 	return node.nodeType === 3;
 }
diff --git a/src/morphlex.ts b/src/morphlex.ts
index 7f89266..c9bb01a 100644
--- a/src/morphlex.ts
+++ b/src/morphlex.ts
@@ -8,6 +8,13 @@ interface ReadOnlyNodeList<T extends Node> {
 }
 
 interface ReadOnlyNodeInterface {
+	readonly nodeValue: Node["nodeValue"];
+	readonly textContent: Node["textContent"];
+	readonly indeterminate: HTMLInputElement["indeterminate"];
+	readonly value: HTMLInputElement["value"];
+	readonly checked: HTMLInputElement["checked"];
+	readonly disabled: HTMLInputElement["disabled"];
+	readonly selected: HTMLOptionElement["selected"];
 	readonly id: Element["id"];
 	readonly tagName: Element["tagName"];
 	readonly nodeType: Node["nodeType"];
@@ -18,6 +25,8 @@ interface ReadOnlyNodeInterface {
 	readonly hasAttribute: Element["hasAttribute"];
 	readonly querySelectorAll: (query: string) => NodeListOf<Element> | ReadOnlyNodeList<Element>;
 	readonly parentElement: ReadOnlyNodeInterface | Element["parentElement"];
+	readonly hasAttributes: Element["hasAttributes"];
+	readonly hasChildNodes: ParentNode["hasChildNodes"];
 }
 
 type ReadOnlyNode<T extends Node> = T | ReadOnlyNodeInterface;
@@ -169,30 +178,44 @@ function isEqualNode(node: Node, ref: ReadOnlyNode<Node>): boolean {
 // so we use type guards instead. This keeps TypeScript happy, while doing
 // the necessary checks at runtime.
 
-function isText(node: ReadOnlyNode<Node>): node is Text {
+function isText(node: Node): node is Text;
+function isText(node: ReadOnlyNode<Node>): node is ReadOnlyNode<Text>;
+function isText(node: Node | ReadOnlyNode<Node>): boolean {
 	return node.nodeType === 3;
 }
 
-function isComment(node: ReadOnlyNode<Node>): node is Comment {
+function isComment(node: Node): node is Comment;
+function isComment(node: ReadOnlyNode<Node>): node is ReadOnlyNode<Comment>;
+function isComment(node: Node | ReadOnlyNode<Node>): boolean {
 	return node.nodeType === 8;
 }
 
-function isElement(node: ReadOnlyNode<Node>): node is Element {
+function isElement(node: Node): node is Element;
+function isElement(node: ReadOnlyNode<Node>): node is ReadOnlyNode<Element>;
+function isElement(node: Node | ReadOnlyNode<Node>): boolean {
 	return node.nodeType === 1;
 }
 
-function isInput(element: ReadOnlyNode<Element>): element is HTMLInputElement {
+function isInput(element: Element): element is HTMLInputElement;
+function isInput(element: ReadOnlyNode<Element>): element is ReadOnlyNode<HTMLInputElement>;
+function isInput(element: Element | ReadOnlyNode<Element>): boolean {
 	return element.localName === "input";
 }
 
-function isOption(element: ReadOnlyNode<Element>): element is HTMLOptionElement {
+function isOption(element: Element): element is HTMLOptionElement;
+function isOption(element: ReadOnlyNode<Element>): element is ReadOnlyNode<HTMLOptionElement>;
+function isOption(element: Element | ReadOnlyNode<Element>): boolean {
 	return element.localName === "option";
 }
 
-function isTextArea(element: ReadOnlyNode<Element>): element is HTMLTextAreaElement {
+function isTextArea(element: Element): element is HTMLTextAreaElement;
+function isTextArea(element: ReadOnlyNode<Element>): element is ReadOnlyNode<HTMLTextAreaElement>;
+function isTextArea(element: Element | ReadOnlyNode<Element>): boolean {
 	return element.localName === "textarea";
 }
 
-function isParentNode(node: ReadOnlyNode<Node>): node is ParentNode {
+function isParentNode(node: Node): node is ParentNode;
+function isParentNode(node: ReadOnlyNode<Node>): node is ParentNode;
+function isParentNode(node: Node | ReadOnlyNode<Node>): boolean {
 	return node.nodeType === 1 || node.nodeType === 9 || node.nodeType === 11;
 }